Just as individual investors have shown a growing preference to use an investment adviser to handle their financial decisions, asset management firms are relying more heavily on sub-advisers to run their mutual funds, according to industry analysts.

In the past week alone, John Hancock tapped Alliance Capital Management to sub-advise one of its new large-cap equity funds. American Express revealed that it will launch two new sub-advised funds and hire sub-advisers on two existingfunds. And American Century Investments won the management of two of the IDEX Funds, replacing GE Asset Management as the sub-advisor.

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